Application that crashed: kontact
Version of the application: 4.3.0 rc2
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.2
Operating System: Linux 2.6.31-3-generic i686
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
I started kontact, switched to the summary, clicked on overdue todo, changed the end time and when i clicked ok kontact crashed.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0x025c1ae3 in QModelIndex (this=0x986e3e8, curNode=0x0, todo=0x9a8d940, addParentIfMissing=false) at /usr/include/qt4/QtCore/qabstractitemmodel.h:366
#7  QAbstractItemModel::createIndex (this=0x986e3e8, curNode=0x0, todo=0x9a8d940, addParentIfMissing=false) at /usr/include/qt4/QtCore/qabstractitemmodel.h:300
#8  KOTodoModel::getModelIndex (this=0x986e3e8, curNode=0x0, todo=0x9a8d940, addParentIfMissing=false) at ../../korganizer/views/todoview/kotodomodel.cpp:360
#9  KOTodoModel::moveIfParentChanged (this=0x986e3e8, curNode=0x0, todo=0x9a8d940, addParentIfMissing=false) at ../../korganizer/views/todoview/kotodomodel.cpp:367
#10 0x025c3549 in KOTodoModel::processChange (this=0x986e3e8, incidence=0x9a8d940, action=1) at ../../korganizer/views/todoview/kotodomodel.cpp:271
#11 0x025caaae in KOTodoView::changeIncidenceDisplay (this=0x996ffa0, incidence=0x9a8d940, action=1) at ../../korganizer/views/todoview/kotodoview.cpp:406
#12 0x025eacfb in CalendarView::changeIncidenceDisplay (this=0x98530e8, incidence=0x9a8d940, action=1) at ../../korganizer/calendarview.cpp:782
#13 0x025f51ec in CalendarView::incidenceChanged (this=0x98530e8, oldIncidence=0x9d32650, newIncidence=0x9a8d940, what=9) at ../../korganizer/calendarview.cpp:726
#14 0x025f5573 in CalendarView::incidenceChanged (this=0x98530e8, oldIncidence=0x9d32650, newIncidence=0x9a8d940) at ../../korganizer/calendarview.cpp:667
#15 0x025fc166 in CalendarView::qt_metacall (this=0x98530e8, _c=QMetaObject::InvokeMetaMethod, _id=93, _a=0xbfb0fb64) at ./calendarview.moc:485
#16 0x07b31343 in QMetaObject::activate (sender=0x9975a50, from_signal_index=6, to_signal_index=6, argv=0xbfb0fb64) at kernel/qobject.cpp:3113
#17 0x07b31fa2 in QMetaObject::activate (sender=0x9975a50, m=0x3571e1c, local_signal_index=2, argv=0xbfb0fb64) at kernel/qobject.cpp:3187
#18 0x0356f159 in KOrg::IncidenceChangerBase::incidenceChanged (this=0x9975a50, _t1=0x9d32650, _t2=0x9a8d940) at ./incidencechangerbase.moc:108
#19 0x02694a96 in IncidenceChanger::changeIncidence (this=0x9975a50, oldinc=0x9d32650, newinc=0x9a8d940, action=-1) at ../../korganizer/incidencechanger.cpp:276
#20 0x0260cd08 in KOTodoEditor::processInput (this=0xa0fac28) at ../../korganizer/kotodoeditor.cpp:258
#21 0x0260811b in KOIncidenceEditor::slotButtonClicked (this=0xa0fac28, button=8) at ../../korganizer/koincidenceeditor.cpp:108
#22 0x005b3bd9 in KDialog::qt_metacall (this=0xa0fac28, _c=QMetaObject::InvokeMetaMethod, _id=33, _a=0xbfb0feb8) at ./kdialog.moc:184
#23 0x0067b86a in KPageDialog::qt_metacall (this=0xa0fac28, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbfb0feb8) at ./kpagedialog.moc:64
#24 0x0260908a in KOIncidenceEditor::qt_metacall (this=0xa0fac28, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbfb0feb8) at ./koincidenceeditor.moc:107
#25 0x0260c5aa in KOTodoEditor::qt_metacall (this=0xa0fac28, _c=QMetaObject::InvokeMetaMethod, _id=69, _a=0xbfb0feb8) at ./kotodoeditor.moc:65
#26 0x07b31343 in QMetaObject::activate (sender=0xa0fad58, from_signal_index=4, to_signal_index=4, argv=0xbfb0feb8) at kernel/qobject.cpp:3113
#27 0x07b31fa2 in QMetaObject::activate (sender=0xa0fad58, m=0x7c0b878, local_signal_index=0, argv=0xbfb0feb8) at kernel/qobject.cpp:3187
#28 0x07b33f53 in QSignalMapper::mapped (this=0xa0fad58, _t1=8) at .moc/release-shared/moc_qsignalmapper.cpp:95
#29 0x07b347ed in QSignalMapper::map (this=0xa0fad58, sender=0x9cf9a00) at kernel/qsignalmapper.cpp:266
#30 0x07b349ce in QSignalMapper::map (this=0xa0fad58) at kernel/qsignalmapper.cpp:257
#31 0x07b3520b in QSignalMapper::qt_metacall (this=0xa0fad58, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbfb10088) at .moc/release-shared/moc_qsignalmapper.cpp:81
#32 0x07b31343 in QMetaObject::activate (sender=0x9cf9a00, from_signal_index=29, to_signal_index=30, argv=0xbfb10088) at kernel/qobject.cpp:3113
#33 0x07b317b8 in QMetaObject::activate (sender=0x9cf9a00, m=0x151f0a4, from_local_signal_index=2, to_local_signal_index=3, argv=0xbfb10088) at kernel/qobject.cpp:3207
#34 0x013393b1 in QAbstractButton::clicked (this=0x9cf9a00, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#35 0x01061c69 in QAbstractButtonPrivate::emitClicked (this=0xa0e6388) at widgets/qabstractbutton.cpp:543
#36 0x010638c4 in QAbstractButtonPrivate::click (this=0xa0e6388) at widgets/qabstractbutton.cpp:536
#37 0x01063b51 in QAbstractButton::mouseReleaseEvent (this=0x9cf9a00, e=0xbfb10680) at widgets/qabstractbutton.cpp:1115
#38 0x00d01c72 in QWidget::event (this=0x9cf9a00, event=0xbfb10680) at kernel/qwidget.cpp:7549
#39 0x01061b0e in QAbstractButton::event (this=0x9cf9a00, e=0x0) at widgets/qabstractbutton.cpp:1077
#40 0x0110bdfd in QPushButton::event (this=0x9cf9a00, e=0xbfb10680) at widgets/qpushbutton.cpp:662
#41 0x00cacc34 in QApplicationPrivate::notify_helper (this=0x8d8a6e0, receiver=0x9cf9a00, e=0xbfb10680) at kernel/qapplication.cpp:4056
#42 0x00cb4d13 in QApplication::notify (this=0xbfb12064, receiver=0x9cf9a00, e=0xbfb10680) at kernel/qapplication.cpp:3758
#43 0x0064aaaa in KApplication::notify (this=0xbfb12064, receiver=0x9cf9a00, event=0xbfb10680) at ../../kdeui/kernel/kapplication.cpp:302
#44 0x07b1b7ab in QCoreApplication::notifyInternal (this=0xbfb12064, receiver=0x9cf9a00, event=0xbfb10680) at kernel/qcoreapplication.cpp:610
#45 0x00cb3c4e in QCoreApplication::sendSpontaneousEvent (receiver=0x9cf9a00, event=0xbfb10680, alienWidget=0x9cf9a00, nativeWidget=0xa0fac28, buttonDown=0x1526aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#46 QApplicationPrivate::sendMouseEvent (receiver=0x9cf9a00, event=0xbfb10680, alienWidget=0x9cf9a00, nativeWidget=0xa0fac28, buttonDown=0x1526aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#47 0x00d223c0 in QETWidget::translateMouseEvent (this=0xa0fac28, event=0xbfb11ccc) at kernel/qapplication_x11.cpp:4409
#48 0x00d2184b in QApplication::x11ProcessEvent (this=0xbfb12064, event=0xbfb11ccc) at kernel/qapplication_x11.cpp:3428
#49 0x00d4e0c2 in x11EventSourceDispatch (s=0x8d7bc00, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#50 0x0186ebc8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#51 0x01872470 in ?? () from /usr/lib/libglib-2.0.so.0
#52 0x018725a3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#53 0x07b4610c in QEventDispatcherGlib::processEvents (this=0x8d5bcd8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#54 0x00d4d7a5 in QGuiEventDispatcherGlib::processEvents (this=0x8d5bcd8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#55 0x07b19d59 in QEventLoop::processEvents (this=0xbfb11fc4, flags=) at kernel/qeventloop.cpp:149
#56 0x07b1a1aa in QEventLoop::exec (this=0xbfb11fc4, flags=...) at kernel/qeventloop.cpp:201
#57 0x07b1c61f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#58 0x00cacab7 in QApplication::exec () at kernel/qapplication.cpp:3525
#59 0x0804b4d6 in main (argc=1, argv=0xbfb12264) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi